Sodium-ion Marine Battery

FLA/EFB/AGM batteries have been dominated the marine battery market for more than one century. Lithium-ion batteries are not good at cold-starting and cannot meet the requirements of starting batteries. Sodium-ion marine batteries have excellent low-temperature performance and can deliver 10C cold cranking amps at -18 degrees Celsius. In terms of CCA performance, sodium-ion marine batteries are better than FLA/EFB/AGM marine batteries. 

FLA/EFB/AGM marine batteries should strictly avoid over-discharge to prevent irreversible loss on capacity. Whilst Sodium-ion marine batteries are not afraid of over-discharge and even can be discharged to 0V, there is no loss of capacity after recharging. FLA/EFB/AGM marine batteries usually need to be charged every 3 months to keep the performance, whilst sodium-ion marine batteries can extend the maintenance to 12 months. 

The abundance of sodium in the earth's crust is 2.3%, ranking sixth among all elements, significantly higher than 0.0017% of lithium. Sodium is widely found on land and in the ocean in the form of salt and is easy to obtain. Compared with FLA/EFB/AGM marine batteries, sodium-ion marine batteries are eco-friendly. Sodium-ion marine batteries do not contain any heavy metals and are 100% recyclable. 

Why and how we designed the innovative and amazing

sodium-ion marine batteries? 

Believe it, before you see it. 

We believe that sodium-ion marine batteries can challenge the market of FLA/EFB/AGM marine batteries. 

Sodium-ion Batteries 101

Sodium-ion battery is a secondary battery that mainly relies on the movement of sodium ions between the positive and negative electrodes to work. It has a similar working principle to lithium-ion batteries, and both are called "rocking chair" batteries. 

The main components of sodium-ion batteries are positive electrode, negative electrode, separator, electrolyte and current collector, among which the structure and performance of the positive and negative electrode materials determine the sodium storage performance of the entire battery. The positive and negative electrodes are separated by a separator to prevent short circuits. The electrolyte infiltrates the positive and negative electrodes as a medium for ion flow, and the current collector plays the role of collecting and transmitting electrons. During charging, Na⁺ escapes from the positive electrode, passes through the separator and embeds into the negative electrode, so that the positive electrode is in a high potential sodium-poor state and the negative electrode is in a low potential sodium-rich state. The discharge process is the opposite. Na⁺ escapes from the negative electrode and passes through the separator and re-embeds into the positive electrode material, restoring the positive electrode to a sodium-rich state. In order to maintain charge balance, the same number of electrons are transferred through the external circuit during the charge and discharge process, and migrate between the positive and negative electrodes together with Na⁺, causing oxidation and reduction reactions at the positive and negative electrodes. 

The Benefits of Sodium-ion Marine Batteries

The abundance of sodium in the earth's crust is 2.3%, ranking sixth among all elements, significantly higher than 0.0017% of lithium. Sodium is widely found on land and in the ocean in the form of salt and is easy to obtain. Currently, the world's proven lithium resource reserves that can be exploited can only satisfy 1.48 billion electric vehicles. As global electrification accelerates, the pressure of lithium resource shortage is further reflected. 

After the sodium-ion marine battery has undergone short-circuit, nail, crush and other tests, there is no fire or explosion. Lithium-ion batteries have the problem of over-discharge, which will cause the copper foil current collector to dissolve, resulting in irreversible loss of battery capacity; while sodium-ion marine batteries have no over-discharge, and the positive electrode can be discharged to 0V without affecting performance, making the battery safer during storage and transportation. At the same time, sodium marine batteries are prone to passivation during thermal runaway, so they perform better in safety tests. 

The high conductivity of sodium ions requires a lower concentration of electrolyte. The viscosity of the electrolyte at low temperatures is lower than that of lithium-ion batteries, and the overall performance of the battery is better. The normal operating temperature range of sodium-ion marine batteries is -40℃-60℃, and the capacity retention rate at -20℃ can reach more than 85%, which is significantly better than the 60-70% capacity retention rate of lithium iron phosphate batteries. 

To help you understand the differences between sodium-ion marine battery and AGM marine battery, the NA2170 Pro is compared with a typical AGM GROUP 27 marine battery as follows: 

The Intelligent Battery Management System

The intelligent battery management system (BMS) enables efficient and safe charge/discharge management and monitoring of sodium-ion cells. By ensuring that the sodium-ion cells operate consistently within their permissible temperature, voltage, and current limits, the intelligent BMS not only effectively extends sodium-ion marine battery's service life but also prevents thermal runaway caused by a lack of monitoring and protection. 

The built-in intelligent BMS in NAPILION sodium-ion marine batteries features an Emergency Start function. The BMS dynamically monitors the battery's state of charge (SoC) and automatically cut-off output to prevent low SoC, ensuring the NAPILION sodium-ion marine battery can successfully start the engine again. 

How to monitor, or upgrade your NAPILION Sodium-ion Marine battery? 

Users can download the free NAPILION App from App Store, or Google Play to monitor their NAPILION sodium-ion marine batteries. The NAPILION App can provide battery real-time monitoring, engine emergency start, warning notification, historical log, battery firmware OTA update to users. 

Find out your requested sodium-ion marine batteries in our 2026 catalog. 

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